Writing pen



FIG. 1 is a right side elevational view of a writing pen showing my newdesign, the opposite side being a mirror image thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view; and

FIG. 5 is a top plan view.

The ornamental design for a writing pen, substantially as shown anddescribed.